I had some good results with silverflow 55 brazing with mapp recently so had another go at the er40 collet chuck. Well it sticks, took a bloody lot of heat and still was not quite hot enough to flow properly. Ive got some ideas, I might try reheating it tomorrow, but I think itll be good enough. Does mean I'll need to face and recut the taper.
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the whole thing would need to be remachined, you'll be amazed at how much distortion there will be from silver soldering/brazing